Mechanism for varying the tension of normalizing springs of typewriters or like machines



Sept. 18, 1951 J. F. KLOSKI 2,567,943

MECHANISM FOR VARYING THE TENSION OF NORMALIZING SPRINGS OF TYPEWRITERSOR LIKE MACHINES Filed Aug. 16, 1949 2 Sheets-Sheet l Sept. 18, 1951 J.F. KLOSKI MECHANISM FOR VARYING THE TENSION OF NORMALIZING SPRINGS QFTYPEWRITERS OR LIKE MACHINES Filed Aug. 16, 1949 2 Sheets-Sheet 2 W \qII I INVENTOR JUH/V F. HLOSK/ BY fl M,

fie ATTORNEYS Patented Sept. 18, 1951 UNITED STATES orrica MECHANISM FORVARYING THE'TENSION "or NORMALIZING SPRINGS OF TYPE- WRITERS R LIKEMACHINES 1..

corporationnf New-York Application August 16, 1949, serial No. 110,534

' Claims. (01. lin -s3) I This invention relates to mechanism forvarying the tension -of normalizing springs of typewriter or likemachines, and more particularly to mechanism for varying the tension ofsprings, the normalizing 'force of whichzhas to be overcome by 'fingerpressure applied to the .space bar or keys of such machines, especiallypower operated typewriters.

The prior art is replete with devices for adjusting the tensionofsprings which function to return key levers of typewriter or likemachines to normal-or non-depressed positions. The principal broadobject of the present invention is to provide key or the likenormalizing spring adjusting mechanism which is of novel and improvedconstruction and arrangement, and which enables fine or closeadjustments to be made without the use of intricate or expensive parts,or the maintenance of uneconomically close tolerances.

In some power operatedtypewriter constructions, a key is depressed tomove an intermediate drive-transmitting element into engagement with acontinuously operating driving member, whereupon the drive transmittingelement is actuated so as in turn, to actuate an associated typewriterinstrumentality, 'e. g, a type bar, carriage feeding or back spacingmechanism, or any of the other well known typewriter mechanisms. In somesuch machines, each key lever is provided with a normalizing orreturning spring; and the associated intermediate or drive-transmittingmechanism is provided with one or more'additional normalizing springsfor the appropriate parts. The arrangement is such that all of thenormalizingsprings associated with a particular mechanism group, forexample, atyping key, typ'e bar, actuating mechanismja'nd interveningconnections, resist depression of the key, .In accordance with thepresent invention, the total normalizing force of a plurality of springstending to resist depression of a single key is made accuratelyadjustable by providing mechanism for variably tensioning one or morebut less than all of the springs associated with each key lever or othermanually operable part. One of the objects of the invention is toprovide a novel, simple, and 'eflicient mechanism for effecting suchadjustments.

A further object of the invention is to provide novel and improvedmechanism for adjusting the position of the normalizing spring anchor ofa typewriter or like machine.

Other objects will become apparent from a reading of the followingdescription, the appended claims and the accompanying drawings, inwhich:

, 2 Figure -1 is a view-,wpartlyinelevation part ly in vertical section,toreand-aft of a typewriter embodying the invention, showing only someof the conventional =orfst'andard typewriter parts order to illustratethe .-application of mechanism embodying the invention to a typewriterconstruction; I H A b 4 Figure 2 is a .-iragmentar-y iore-and-aftsection-a1 view of thespring tension adj usting mechanism-lshown inFigure '1, drawn on an enlarged scale,-the section being on the 'line-2--2 of Figure '3;

Figure 3'is :a horizontal sectional view on the line 3 3' of {Figure:1,- drawn onan 'enlargediscale, with somepartsomitted;

Figure 415 a detail perspective iviewof-an indicator sector ineluded in.the construction disclosed in'Figures 1,a2; :and 3; Figure 5 is avertical fore-and-iaft :sectional view similar to Figure -2'but showinga modified construction; and.

Figure 6 is a :viewa-lso similar to Figure '2 but showingatiurthermodified construction.

The invention may :bezemb'odied in typewriters or ilike machine ofvarious ..=kinds. For :the Spunpo'se's'rof illustration, the invention:is shown as being embodied in an ioffice rtype wpewriter hav' ing,except iior the powerime'chanism and spring tension adjusting mechanismto be *described, many features in common with the well known RoyalStandard typewriter. The drawings show onlyaen'ou'gh of thestandard orknown typewriter construction 'tofa'ssi-s't in illustrating the mannerin which mechanism embodyin the invention may be 7 coordinated' wi thother-parts of "a was: Writer construction.

I The known con'strtiction illustrated incl-tides a a sewage B-'eq'u'ipped V n C ismoiinteii for letter spacingreturn-movementsbymeans or a top rail 1 se cured :to the -fiari'ciagfe,and rolling upon balls 2,

which in tam are adapted to roll on a namemounted bottom raiPortrao'k 3.v

The carriage mayfbe driven towardlth'edft, that is, .inthe"letter-'spa'cing direction, by any suitable mechanism, "forjeiiample, *by' a spring barrel and draw band oi'known or suitableasistruction (not shown), un'derfthe contij'ol off'suitableescapementfmechanism operated,.-'for exam} ple, as disclosed in thecopenciing application (if Henry :J. Hart, serial. 1983138, I'fild June.13; 1949 (now Patent No. 2,563212-2, aated Ai 1gilSt 7, 951), K 7, I rReturning pf tl ie-carriagestowardtheright may be effected by powercontrolled :sfrom the typewriter keyboard, for example, by mechanism orthe kind disclosed in the copending application of Henry J. Hart, SerialNo. 21,476, filed April 16, 1948.

The machine is provided with the usual complment of type bars, one ofwhich is shown at 4 in Figure 1 as being pivoted at 5 on a support orsegment 6 equipped with a type bar abutment or banking ring 1. Normallythe type bar 4 is in the position shown in Figure 1 with the type headresting upon a cushion 8. The type bar segment 6 may be shifted to upperand lower case positions by any suitable mechanism, for example, bypower-operated mechanism of the kind shown in the copending applicationof William H. Kupper, Serial No. 133,322, filed December 16, 1949.

Power for operating the type bars or other instrumentalities is suppliedby an electric motor (not shown), which drives an actuating mechanismgenerally designated D. The mechanism D is generally similar tomechanismdescribed and claimed in copending application Serial No.98,738'referred to'above,-and is similar to but embodies improvements inmechanism disclosed in the copending application of William H; Kupper,Serial No. 6.066, filed February 3, 1948. It includes a continuouslyoperating driving member and controllable driving connections, whichnormally are-inoperative or ineffective; but which may be conditioned bythe operator to effect operative driving connection between thecontinuously moving driving member and the instrumentalitiesto beoperated. The driver is constituted by a continuously rotating element,more particularly a toothed snatch roll or bar 9, which may be of knownform, and which is adapted to be driven in the direction ofthe arrow ainFigure 1.

The mechanism for transmitting drive from the driver 9 to each of thetype bars 4 includes an actuator 10 which extends fore-and-aft of thetypewriter and above the member 9. The actuator 19 is pivoted as at H toa lever 12 at a point oifset relatively to the pivotal mounting 13 ofthe lever on a fixed frame cross bar 14. Theactuator hasa forwardlyextending part l5 projecting under an abutment or guide plate l6 mountedby screws 11 on the frame, A to extend parallel to the snatch roll 9.The downwardly extending part [5 of the actuator I projects through aslot (not shownlin the lower guide plate 18 which issecured to the frameby the screws I1. The actuator part I is cooperable with an adjustableknock-oif plate or member l9 for a purpose to be described hereinafter.

A normalizing spring 20 is interposed between the front end of theactuator and an anchor plate 2| securedby screws '22 to a fixed crossbar 23. The spring 20 normally maintains the actuator 19 in thepositionshown in Figure 1 withthe front end of the actuator immediatelybelow the upper guide plate 16.

The guide plates l6 and I8 and the spring anchor 2| extend across thefront of the machine, the guide plates being cooperable with otheractuators and associated parts similar to the actuator 10 and itsassociated parts, and the anchor 21 serving to anchor springs connectedto the other actuators and corresponding to the spring shown in Figures1 and 2.

A link 24, pivotally connected to the lever l2 and the heel of the typebar 4 at 25 and 26 respectively, causes the type bar to be drivenclockwise to printing position when the lever 12 is rockedcounterclockwise in the manner described below.

In order to apply a power impulse to the ty e bar 4, the actuator 10 isoperatively but indirectly connected to the driving member 9, theactuator itself neyer engaging the driving member. Mechanism forbringing about the operative connection of the actuator element ID tothe member 9 includes an interponent pawl 21, pivoted as at 28 on theactuator. A spring 29, anchored to the actuator 10 and connected to thepawl 21, biases or urges the latter to rock clockwise so as to move itsnose 21 into engagement with the snatch roll 9. Normally, the pawl ismaintained out of engagement with the snatch roll by the restrainingaction of a control element or trigger 30 which is pivoted as at 3| onthe actuator Ill. In the normal position of the trigger, its rear end 32engages a holding surface 33 on the pawl so as to prevent the spring 29from rocking the pawl element 21 into transient drive-transmittingengagement or connection with the driving member 9. The pawl 21 isformed with an inclined resetter cam face 34 which is located just belowthe holding surface 33; and which is acted upon by the trigger forrocking the pawl counterclockwise, and thus resetting it in normal,inoperative position.

Operator controlled means including a manually operable key 35 pivotedat 36 on the frame A is provided for bringing about operative drivingconnection between the driver 9 and the actuator 10. The key 35 has anupward projection 31 disposed behind an arm 38 of an operating lever 39,pivoted as at 49 on the frame-mounted cross bar 23.' The lever 39 hasanother arm 4| on which a limber dog or flipper 42 is pivoted at 43. Aspring '44 urges the limber dog 42 to rock clockwise to yieldably retainit in its normal posi-,- tion of rest against a limit stop 45 and abovean ear 46 on the actuator 19. The dog 42 can swing counterclockwise fromthe position shown in Figure 1, but cannot move clockwise from thisposition.

A normalizing or returning spring 41 is connected at its lower end tothe intermediate lever 39, and at its upper end to a spring anchor 48secured to the cross bar 23 by the screw 22. The. anchor 48 extendstransversely of the machine so as to provide an anchorage for springscorresponding to the spring 41 and connected to other intermediatelevers such as the lever 39 shown in Figure l. The spring 41 normallyholds the intermediate lever 39 in the position shown in Figure 1, sothat the lower end of the flipper 42 is positioned just above the ear 46on the actuator 19.

The key lever 35 is normally held inelevated position by a normalizingspring 49, the lower end of which is connected to an ear 50 on the keylever, and the upper end of which is con-' nected in an aperture 5|formedin an anchor plate 52 which may be adjusted to vary the tensioningof the spring in a manner to be described hereinafter. -In operation,when the key 35 is depressed, the lever 39 is rocked clockwise to causethe flipper 42 to push the actuator I0 downwardly to an initial extentsufficient to bring thetrigger 39into engagement with the abutment 18.This causes the trigger to be rocked clockwise about its pivot 31, so asto release the pawl 21,.which is then moved by the spring 29 intoengagement with the snatch roll 9. The snatch roll then drives the pawl21 and actuator ID as a unit so as to rock the lever 12 and operate thelink 24 and type bar 4. When the pawl 21 is cast off active position.The parts will then be returned 7 to their normal positions by thecoaetion of, the springs 20 and 41 and a spring 53 interposedBetwe'euthe rear of the frame" A- and a fink 54 connected to the lever12.

{Means of the disclosed in thelcopenw 'i'ng application of Henry J.Hart, siil iallNQ 102,634,- are provided for'adjustingorvaryingtheamount -of driving impulse delivered to the in,-

dpawl 21 by the snatch roll 9. "The indi-vidual variation or adjustmentis effected-by variably limiting the extent to which the actuator pawlnose 21 enters a tooth inters csa'ce on the'snatch roll 9 under the urgeof the spring ifwhen the restraint of the trigger- 39 on the paw/r 21 isdiscontinued. In the form shown, the actuator It is providedwitha-downwardly extending stop element or finger which is disposed infront of and normally out of contact" with a downwardly extending stoppart, heel, or finger 56' on the pawl 21. When the pawl -21 is rockedclockwise by the spring 29* so as to move the pawl nose 21 into a"snatch roll "tooth interspace, the pawl stop '55 moves towardtheactu'ator stop55, which may be so positioned to be engaged by thestop 56 to arrestrockmg-of the pawl '2'! before the tooth Thmcves to'the root of the snatch roll tooth interspace. fiyvariably positioningcheer the stops 55555, e. -g"., by bending the stop 55 towards or awayfromthe stop 56-, the extent to which the pawl tooth "21 enters thetooth interspace can-be varied. Consequently, the angle through whichthe snatch roll rotates while in contact with the-pawl, which determinesthe amount of drivi n'g of the" pawl 21 and actuator II by the snatchroll 9, can b'e varied.- Any suitable'means or construction may beprovided for adjusting one of the-stops 55, -56 relatively to the other.In' the preferred construction the stop 55' is formed irrtegral-ly with'the actuator so 'as to be bend 'aloletoward or away from the "stop-56.

In typewriters or like machines in which all 'or'some of theinstrumentalities to be operated,

mecharrism, tabulating mechanism, as wellas g escapement mechanism,carriage return typing mechanism, are operated-by power, it is This maybe accom- Figure 1. Any suitable means (not shown) may be'provided foradjustably tilting or otherwise va'ria'bly positioning theknock-ofi bar1 9 so that it will be engaged by the lower ends of the act'uators tocontrol the timing 'of disengagement of. the associated actuator pawlsfromthe snatch r011.

In-order to avoid congestion of the parts at the front of the machine,principally the-key "fevers and space bar, the key levers 35 aremounted, some on the :upper'pivot rod 35 and othersoii a lower pivot 51as shown'in Figure 1, "arrangement being described: more fully *in thespring anchor 52. Figures 1-to4, a U-shaped bracket 65 is secured-to=the front frame cover by screwsjone-of the mpending application-ofWilliam Kupper'. 'figlififievpreviously referred to. keysronisome of the'keylovers 3!: arelocated more. distantly fromthe associated pivots thantherkeys-cn otheriofthe key levers. To com-- perxsate ion thediffierences leverage so as to provide rsubs-tazrtial uniformity oftouch--,-or resistancerto r-key depression, the keylever=returning-.springs liif may have-different characteristics-so asto exert difierent' key raising. or normalizing efforts. wTh'llS, thesprings connected to the key levers having keys on the --first'--,orlower bank of keys:-may be somewhat stronger thani'the springe torreturning-501' normalizing theikey .:levers having keys in the secondbank. ;.:.It-nwi1l be seen-"that alt of the springs asso- "ciatedWithieach key lever 35, namely, the actuator normalizing. spring '20-,the intermediate lever normalizing spring 41, and the key levernormalizing; spring 49, resist depression of the-key I'VGEL: *Inacco'rdan'ce with the present invention, the touch or force-needed tobeexerted on a k'ey for actuating the associated mechanism-4s regulatedby varying or adjusting the tension of less-thar'rall of the associatedthree springs. the-form shown Figures 1 to- 4; thetouch is' regul'atcd;by adjusting or -varying the tens-ion of "only once-of: the threespringaspecifically;the spring. 49" connected between the key lever-andthe/anchor 52.

Such adjustment is effected by changing-the position of the'anchor 52bymecha'nismhow'to be described. The anchor 52 isintheform-ofaplateextending transversely of the machineahd ham-pg a part-58" wrappedaround a rod 59 and secured to the-rod. by pins 58. The-rod- 59 pivotend portions 60' which extend through re pivotedin openings in bearingplates B l secured byscrews'fl -to brackets 63 mounted on-"the mainframe A. The brackets 63*are formed with-open-end slots' fi'l whichreceive the pivot parts 60 of the rod 59.. Because of the slots 64 beingopen at their front ends,- the "anchor assembly 5 2-'59 may readily bedismounted from thebrackets 63 by removing the screws62 so as to freethe plates 6 I. The brackets '63 support the knock-off bar 19- arTT' thecross bar 2-3 previously referred 'to.

When the anchor 52 is rocked clockwise "as viewed-'inFigures 1 and 2,thesprings 49 are stretched or additionally tensioned so asto requireaheavier or increased touch for operating thekey lever 35 and theassociated intermediate lever 39 and actuator ID. Conversely, when theanchor'52 is rocked counterclockwise, the spring ""49" is permitted tocontract so as to 'reduce lt tension. thereby providing foroperati it alighter touch.- Close controlof the -v'ariation m the touchrequ'iredismade possible by varying thdtensidn ofonly one of the springs opposingdepression of the key lever 35", the arrangement 'being such thatconsiderable movement of the jumpy or erratic changesin the touchregulation.

Improved mechanis is provided for rocking In the form shown in which isshown at 6]. The upper andlowenlegs of. thebracket provide bearings fora. shat-t 7 formed at itslower end with ascreworrworm thread 69. Ashoulder :18 on the shaftGB abuts the upper leg of the bracket 65 tohold the shaft 68 against upward .movement, and a. knob. 11 secured-tothe top of theshaft 88 .by set screws H holds the shaft against downwardmovement. A worm wheel sector-12 secured to the anchor rod 59 by asetscrew 13 is formed with a series of teeth'meshing with the worm teeth89, so that, upon rotation of the shaft 68 by the knob. 11, the sector12 and the anchor ;52 will be rocked about the axis of the pivots 68 soas to vary the tension of the spring 49.

; In order to limit rocking ofz theanchor 52 and to prevent over-orunder-stressing of the springs 49, thesector 12 is formed withstopportions and 15 (Figure 2) at the respective ends of the series ofsector teeth onthesame are and diameter as the crests of theteethn Whenthe 'partsare in a limit position, as shown in Figure 2,- anupperthreadconvolution of the worm 69 .willbear against the stop portion-15so as to prevent further rotation ofv the knob H and rockingof-the-anchor 52, thus preventing over-stressing of the springs 49.Similarly, when the sector'12 is'grocked counterclockwise to itsopposite limit position, a lower thread convolution on the worm .69,will bear against the other stop portion 14 so as, to prevent furtherrockingof the anchor 52. The stop portions 14 and 15 serve not. only tolimit the adjusting of the springs 49, but also to prevent the worm 69and sector teeth from being unmeshed. I H In orderthat the operator maybe. informed {as to the touch regulation, an indicator sector 16issecured tothe spring anchor rod 9.by means :of a set screw 11, and is,provided peripherally with scale marks 18 viewable througha window oropening 19 above which is a pointer 88, adapted to register with a scalemarking. 18 for indicating the particularsetting or adjustment of thetension of the returning springs 49. Y

. In the modification shown in Figure 5, the key mechanism 35, 36,intermediatelever 39, and acmating-mechanism including the actuator I8are ,thesame as are shown in Figure l, and are shown gonly partiallyinFigure 5.. The mechanism shown in Figure 5 differs from that previouslydescribed in that-the key'lever normalizing spring 49 is under constanttension, whereas the actuator normalizing spring 28 and the intermediatelever normalizing spring 41 are arranged to beadjusted. The Figure 5construction, however, is similar to the construction shown in Figures 1mam that lessthan all. of the springs which fresist the depression. ofthe associated key are adjustable, so that a smooth, dependable adjust-"ment' or regulation of the touch is obtainable. As shown in Figure 5,an adjustable spring anchor {8| is provided with ears,- one, 82, ofwhich is shown, pivoted ona rod 83 carried by ears, one of f'which isshown at84 extending forwardly from Ftheframe cross bar 23. The rod 83serves not "only as apivot for the anchor 81, but also as an upperanchorage for the non-adjustable key.

lever normalizing springs 49. The anchor BI is formed with holes 85'forattachment of the upper ends of the springs 28 and 41.. .1

Mechanism for rocking the anchor 8| includes '-a bracket'86 secured by ascrew 81 to the front mask panel 66, and an internally threaded sleeve588 extending throughwhich is an adjusting screw 89, The partsare so'mounted that the screw axis extends upwardly and forwardly with respectto-the machine. A'clevis 88 is mounted on the .part I by screws I2I.

8 I lower end of thescrew 88 by a connectioncomprising a roove 9| in thescrew, and a pin 92in the clevis extending tangentially through thegroove so as to permit relative rotation ofthe screw and clevis, but soas to constrain the clevis to partake of the translatory movement of thescrew. A coupling pin 93 extending transversely through the clevis 98 isencompassed by the wrapped end 94 of, a leaf 95 riveted as at 86 totheanchor 8|. A. knob 91 is secured to the upper end of the screw 89 bya set screw 98, and is formed with a frusto-conical circumferential part99 provided with scale markings I88 which may be read in connection witha fixed pointer. I8I secured to the front maskpanel 66 by the screw .81.By rotating the knob 81, the screw is caused to move upwardly ordownwardly so as to rock the anchor 8| about its pivot 83,,thereby'increasingfor decreasing the tension of the normalizing springs20 and 41. Theinclination of the frusto conical scale portion 99facilitates observation or reading of the scale-indicated adjustment ofthe spring tension, and hence facilitates setting the touch controlmechanism. v

The modified construction shown in'Figure G is adapted for use inconnection with keymech'a nism, intermediate lever mechanism, andactuator mechanism of the kind disclosed in Figure .l, andonly apart ofthe actuator I8 is shown. In this embodiment of the invention, only oneof thethree normalizing springs, namely, the actuator. normalizingspring 28, is adjustable. A bracket I82 secured to the frame crossbar 23is formedwith a fixed front anchor I83 for the key lever normalizingsprings 49, and witha fixed rear anchor portion I84 forthe intermediatelever normalizing springs 41. The bracket I82 has an upper part I85secured to the front frame panel 86 by a screw 186. Ears, one of whichis shown at. 181, on .the bracket I82, support a pivot rod I88 on which'are'pivoted ears, one of whichi's shown at I89, extending downwardlyfrom an adjustable anchor IIU for the actuator springs 28. The tensioninof the springs 28 is adjusted by rocking the anchor 'I I8 bymechanismincluding an ear III on the bracket I82, on which is mounted apivot screw I I2 for a manually adjustable arm or lever I I3. Alink I I4is pivoted at I15 to th arm H3, and 'is pivoted at .I IE to an ear I I1-on an extension I I8 of the anchor I I8. Rocking of the arm I I3 aboutits pivot I I2 acts through the link I I4 and extension I I8 to rock theanchor H8 so as to increase or decrease the tension of the springs 20,according to the direction in which the arm I I3 is rocked. In'orderthatthe arm II 3 will be retained releasably. in a selected or set positionof adjustment, it is formed withja plurality of flat ,ohordal partsII9'contactable with a leaf spring I28. secured to the bracket upper Anindicator segment I'I2 secured to the bracket upper part I85 and thefront mask panel 66 by the screw I88-is formedwith three raisedindicator or. guide parts 123 for assistingrtheoperator in determiningthe set or adjusted position of the arm I I3, and hence the tensioningof the springs 28 and the'touch regulation. I a I Preferred embodimentsof touch control mechanism constructed in accordance with, the inventionhave been describ'ed as applied to the "type ing keys of a typewriter.Mechanism embodying the invention, however, maybe and 15mtended to' beused in connection withthe other keys of typewriter or like machines,suchas'the space bar I24, shift key I25, and back spacing key 126, allof which are indicated in Figure 1. Itmay also be: applied in connectionwith such other auxiliary or service keys as the shift lock key,.tabularkey, margin release key, and the carriage return key of a power operatedtypewriter. 7

Because of the dependable and close regulation of the touch which can beaccomplished with mechanism .embodying the present invention, suchmechanismrhas particular utility in connection with power operatedtypewriters constructed for operation with a touch lighter than normallyis required in operating a conventional manually operated machine. Whenanexperienced operator, accustomed to using a. manually operatedtypewriter, first uses a power operated machine, the operator mayfindthe touch unsatisfactorily or..unpleasingly light. During transitionfrom manual machine operation. to powered machine operation, it may bedesirable to set the touch regulating mechanism so as to require a keypressure not too much less than is required in the use of a manuallyoperated machine, and thereafter to decrease the pressure from time totime until full advantage of the light touch characteristics of a poweroperated typewriter can be realized to the satisfaction of the operator.For this reason, and because of the very close and reliable key pressureregulation obtainable with mechanism embodying the invention, theinvention is particularly, although not exclusively, adapted for use inpower operated typewriters.

The constructions shown and described embody the invention in preferredforms, but. it is in tended that the. disclosure be. .illustrativerather than definitive, the invention being defined in the appendedclaims.

I claim:

1. In a power operated typewriter or like. machine, a power drivenmember; instrumentalities to be operated by said member; actuatorsrespectively connected to. said instrumentalities; a spring anchor; aset of normalizing springs con-' nected to said anchor and respectivelyconnected to" said actuators for .yieldably holding said actuatorsdisconnected from said member; means including key levers for movingsaid actuators selectively against the urge of the associatednormalizingsprings into engagement with said member; another springanchor; a set of normalizing. springs connected to said. other springanchor andrespectively connected to said key levers; means mounting. oneof said anchors pivotally to rock about an axis oifset from the pointsof connection of the associated springs thereto; a worm wheelsectorpconnected to the pivotally mounted anchor; and a manuallyrotatable worm cooperable with said worm wheel sector for rockingthepivotally mounted anchor to vary the normal tensioning of the springsconnected; thereto.

2. In a power operated typewriter or like machine,.a power drivenmember; instrumentalities to bev operated by said member; actuatorsrespectively connected to said instrumentalities; a spring anchor; a setof normalizing springs connected to said anchor and respectivelyconnected tosaid actuators for yieldably holding said actuatorsdisconnected from saidmember; means including key levers for moving saidactuators selectively against the urgeof the associated normalizingsprings into engagement with said member; another. spring anchor; a setof. normalizing springs connected to said other spring anchor andrespectively connected to said key levers; means mounting one of saidanchors pivotally to rock about an axis offset from the points ofconnection of theassociated springs thereto; a worm wheel sectorconnected to the pivotally mounted anchor andhavinga series of teethand, stop portions respectively at the ends of the series and on. thesame are andldiameteras the crests of the teeth; and a manually operableworm meshing with said sector teeth and being cooperable therewith forrocking the pivotally mounted anchor to very the tensioning of thesprings connected thereto, said stop portions beingenga'ge'able by theworm teeth for determining limits of rocking of the pivotally mountedanchor.

3. In a power operated typewriter or like machine, a power drivenmember; instrumentalities to be operated by said member; actuatorsrespectively'connected'to said instrumentalities; a spring anchor; a setof normalizing springs cone nected to said anchor and respectivelyconnected to said actuators for 'yieldably holding said actuatorsdisconnected from said member; means including key levers for movingsaid actuators selectively against the urge of theassociated normalizingsprings into engagement with said member; another spring anchor; a setof normalizing springs connected to said other spring anchor andrespectively connected to said key levers; means mounting one of saidanchors piv otally to rock about an axis offset from the points ofconnection of the associated springs thereto; a fixed, internallythreaded sleeve; a manually rotatable screw having threaded engagementwith said sleeve; and means connecting said screw to the pivotallymounted anchor for rocking the latter in consequence of translatory movement of thescrewcaused by manual rotation thereof.

4. In a poweroperate'd typewriter or like machine, a power driven"member; instrumentalities to be operated by said member; actuatorsrespectivelyconnected to said instrumentalities; a spring anchor; a setof normalizing springs con-'- nected' to said anchor and respectivelyconnected to said 'actuators'for yieldably holding said notu'atorsdisconnected from said member; means including key levers for movingsaid actuators selectively against the urge of the associatednormalizing springs into engagement with said member, another springanchor; a set of normalizing springs connected tosaid other springanchor and respectively connected to said key levers; means 'mountingone 'of said anchors pivotally to rock about an axis offset-from thepoints of connection of the-associated springs thereto; a pivotallymounted, manually operable adjusting arm connected to thepivo'tallymounted anchor for rocking the latter to vary the normal tensioning ofthe springs connected'thereto, said arm being formed with a plurality'of' fiat surfaces.v substantially chordal with respect to the arm pivotaxis; and a leaf spring adapted to bear against any one of saidsurfaces, according to the position of said arm, for yieldably holdingthe'latter in set adjusting position.

5. In a power operated typewriter or like machine, a power drivenmember; instrumentalities to be. operated by said member; actuatorsrespectively connected to said instrumentalities; a sprin anchor; a setof normalizing springs connected to. said anchor and respectively.connected: to. said actuators, for yieldably holding said actuatorsdisconnected from said member; means including key levers for movin saidactuators selectively against the urge of the associated normalizingsprings into engagement with said member; another spring anchor; a setof normalizing springs connected to said other spring anchor andrespectively connected to said key levers; means mounting one of aidanchors pivotally to rock about an axis offset from the points ofconnection of the associated springs thereto; a pivotally mountedmanually operable adjusting arm; means including a link connecting saidarm to the pivotally mounted anchor for rocking the latter when theadjusting arm is rocked to vary the tensioning of the springs connectedto the pivotally mounted anchor, said arm being formed with a pluralityof fiat surfaces substantially chordal with respect to the arm pivotaxis; and a leaf spring adapted to bear against any one of saidsurfaces. according to the position of said arm, for yieldably holdingthe latter in set adjusting position.

- 6. In a power operated typewriter or like machine, a power drivenmember: ,instrumentalities to be operated by said member; actuatorsrespectively connected to said instrumentalities; a first spring anchor;a set of normalizingsprings connected to said first spring anchor andrespectively connected to said actuators for yieldably holding saidactuators disconnected from said member; means including key levers formoving said actuators selectively against the urge of the associatednormalizing springs into engagementwith said member; another Springanchor; a set of normalizing springs connected to said other springanchor and respectively connected to said key levers; means mountingsaid first spring anchor pivotally to rock about an axis offset from thepoints of connection of the associated springs thereto; and manuallyoperable means for rocking said first spring anchor to vary the normaltensioning of the springs connected thereto.

'7.'A construction as set forth in claim 1, in which the springsconnected to the key levers are connected to the pivotally mountedanchor.

8. A construction as set forth in claim 3, in which the springsconnected to the actuators are connected to the pivotally mountedanchor.

9. A construction as set forth in claim 4, in which the springsconnected to the actuators are connected to the pivotally mountedanchor.

10. In a power operated typewriter or like machine, a power drivenmember; instrumentalities to be operated by said member; actuatorsrespectively connected to said instrumentalities; a first spring anchor;a set of normalizing springs connected to said anchor and respectivelyconnected to said actuators for yieldably holding said actuatorsdisconnected from said member; key levers; intermediate leversrespectively interposed between said key levers and said actuators andbeing responsive to key lever depression for moving said actuatorsselectively against the urge of the associated normalizing springs intoengagement with said member; another spring anchor; a set of normalizingsprings connected to said other spring anchor and respectively connectedto said key levers; a set'of normalizing springs connected to said firstspring anchor and respectively connected to said intermediate levers;means mountin one of said anchors pivotally to rock about an axis offsetfrom the points of connection of the associated springs 12 thereto; andmanually operable means for rock-,- ing the pivotally mounted anchor tovaryv the normal tensioning of the springs connected thereto. I

11. A construction as set forth in claim 10, in which said first springanchor is pivoted and said other spring anchor is at the pivotal axis ofsaid first spring anchor. g I 12. A construction as set forth in claim10, in which the springs connected to the intermediate levers and theactuators are connected to the pivotally mounted anchor. g

13. In a power operated typewriter or like ma chine, a power drivenmember; instrumentalities to be operated by said member; actuatorsrespec tively connected to said instrumentalities; a spring anchor; aset of normalizing springs connected to said anchor and respectivelyconnected to said actuators for yieldablyholding said actuatorsdisconnected from said member; key levers intermediate leversrespectively interposed be tween said. key levers and said actuators andbeing res onsive to key lever depression formoving said actuatorsselectively against the urge of the associated normalizing springs intoengage ment with said member; a second spring anchor; a set ofnormalizing springs'connected to said second spring anchor and'respectively'connected to said key levers; a'third spring anchor asetof normalizing springs connected to said third spring anchor andrespectively connectedto said intermediate levers; means mounting'one ofsaid anchors pivotally 'to rock'about an axis offset from the points ofconnection of the associated springs thereto; and manually operablemeans forro'cking the pivotally mounted anchor to vary the normaltensioning of the springs connected thereto. 14. In a typewriter or likemachine,'instrumentalities to be operated; means including key-operatedlevers for effecting operation of said instrumentalities selectively; aspring anchor; a set of springs connected to said anchor and respec-'-tively connected to said levers; means mounting said anchor pivotally torock about an axis onset from the points of connection "of said springsthereto; an internally threaded sleeve fixedly mounted on the machineadjacent the front thereof and with its axis being inclined forwardlyand upwardly with respect to the"ma'chine;'fa screw having threadedengagement 'withsai'd sleeve; means connecting the lower'end of saidscrew to said anchor for rocking the latter in con sequence oftranslation of said screw caused by rotation thereof; a manuallyrotatable knob secured to the upper end of said screw and having ascale-marked frusto-conical peripheral portion; and a fixed pointercooperable with the scale markings for indicating the rotated positionof said knob and screw and hence the rocked position of said anchor andthe degree of tensioning of said springs. i i 15. In a typewriter orlike machine, instrumentalities to be operated; means includingkeyoperated levers for effecting operation of said instrumentalitiesselectively; a spring anchor; a set of springs connected to said anchorand respectively connected to said levers; means mount ing said anchorpivotally to rock about an axis offset from the points of connection ofsaid springs thereto; a pivotally mounted, manually operable adjustingarm connected to said anchor, said arm being formed with a plurality offlat surfaces substantially chordal with respect to the arm pivot axis;and a leaf spring adapted to bear 13 against any one of said surfaces.according to the position of said arm, for yieldably holding the latterin set adjusting position.

JOHN F. KLOSKI. 5

REFERENCES CITED The following references are of record in the file ofthis patent:

Number 14 UNITED STATES PATENTS Name Date Hess Aug. 4, 1908 Crawley May15, 1923 Ellis May 26, 1925 Hokanson Jan. 18, 1927 Myers Aug. 15, 1939Yaeger Sept. 2, 1941

